As a Foxpro programmer trying to migrate to PHP, 

Is it possible with PHP to automatically refresh some fields in a form based on a choice made from a combi/list box,  something along the operation of the [valid()] clause in Foxpro & Access without having to click on the [submit] button

I could do it using multiple similar hidden forms,  but it's less user friendly than just clicking on an item (say "apples"),  then automatically populating the next combi/list with "Granny Smith", "Golden Delicious" etc,  and filling  "unit of sale" & "Unit cost"  text boxes with the last entered value.

Then when the variety is redefined,  refreshing again the "unit of sale" & "Unit cost"  text boxes 

Any chance in later versions,  or is it just not possible within the PHP framework?